The present invention is a first step intended to provide a routing method in the B-ISDN network, and determine the path to see if the called number through the root scenario call processing message is received, and; A second step that when the determination by the failure path is found occurring, so that until the received release signal of the selected path to the path failure has not occurred by the cuzz value, the connection between the subscriber and the set; When the release signal is received, the call by the configuration including the third step of transmitting a disconnection signal to the link receiving the processed messages from the B-ISDN networks, as well as disorders of the line connected to the station the exchange stations exchange with other stations exchange even if a failure occurs in the connected lines it will be able to continue to provide telecommunications services in the event of failure to try again with another detour route.
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